329A
  • 329A
  • 329A
Valvo

329A

49.00 USD

Best quality 6-pin shoulder type pentodes 329A manufactured by Valvo in Germany between 1929 - 1945 smoked brown glass (Valvo Radiorohrenfabrik GmbH; Hamburg) identical to Western Electric WE 329A and similar to 311A and 311B (but 10v filament for those 5 pin tubes). 329A low power cathode type pentode indirectly heated 7.5 volt filaments, If 0.86 amp, have first grid connected to top cap. They were mainly used for carrier frequency and radio frequency amplifiers in military equipment, and may also be triode connected for audio amplifiers (about 2 watts identical to Western Electric 329A triode-connection).

Condition

Tube Matching
Tube Matching
6.00 USD by tube

WHY ?

A tube may have one, two, or three internal sections depending on the purpose of the tube; somtimes these sections are all the same, sometimes they are different. Due to manufacturing and material tolerances, there may be slight differences between the original specification and the actual tube. Tube matching tests each one of these internal sections and selects tubes, compared to original specifications at manufacture, for balanced performance and good sound.

HOW ?

All our tubes are tested by us prior to packing on our Stark, AVO, Simpson or RF Laboratories Inc. calibrated testers. On request for tube matching, tubes are matched for Mutual Conductance in Micromhos and Plate Current in Milliamps on our Amplitrex or Radioelec Duovac testers, with results printed for each  individual tube. Certain tubes difficult to test are matched for Mutual Conductance in Micromhos only on one of our regular calibrated testers. On request we can also test for Microphonics.

Quantity

Valvo
281 Items

Data sheet

Base
6 pin UX6
Boite type
2/1
Emplacement
24+5
Quide
42673
Fonction
Pentode
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